<template>
    <div :class="classes">
        <slot></slot>
    </div>
</template>
<script>
import { findComponentsDownward } from '../../../utils/assist'
import Emitter from '../../../mixins/emitter'
import size from '../../../mixins/size'

const prefixCls = 'sh-checkbox-group'

export default {
  name: 'CheckboxGroup',
  mixins: [ Emitter, size ],
  props: {
    value: {
      type: Array,
      default () {
        return []
      }
    }
  },
  data () {
    return {
      currentValue: this.value,
      childrens: []
    }
  },
  computed: {
    classes () {
      return [
        `${prefixCls}`,
        {
          [`sh-checkbox-${this.sizes}`]: !!this.sizes
        }
      ]
    }
  },
  mounted () {
    this.updateModel(true)
  },
  methods: {
    updateModel (update) {
      this.childrens = findComponentsDownward(this, 'Checkbox')
      if (this.childrens) {
        const { value } = this
        this.childrens.forEach(child => {
          child.model = value

          if (update) {
            child.currentValue = value.indexOf(child.label) >= 0
            child.group = true
          }
        })
      }
    },
    change (data) {
      this.currentValue = data
      this.$emit('input', data)
      this.$emit('on-change', data)
      this.dispatch('FormItem', 'on-form-change', data)
    }
  },
  watch: {
    value () {
      this.updateModel(true)
    }
  }
}
</script>
